Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3
Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3
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DOI：
10.1063/1.3560062
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发表时间：
2011-02-28
影响因子：
4
通讯作者：
Tanaka, K.
中科院分区：
文献类型：
--
作者：
Hirori, H.;Doi, A.;Tanaka, K.
采用倾斜泵浦脉冲前沿的方法，对飞秒激光脉冲在铌酸锂中进行光整流，产生单周期太赫兹脉冲。在我们的太赫兹产生装置中，光栅的图像与倾斜的光脉冲波前重合的条件被满足，以获得最佳的太赫兹光束特性和泵浦-太赫兹转换效率。通过使用非致冷微测辐射热计阵列太赫兹相机，它被发现，太赫兹光束离开LN晶体的输出面可以被视为一个准直，而不是点源。所设计的聚焦结构使准直太赫兹光束聚焦紧密，光斑尺寸接近衍射极限，最大太赫兹电场为1.2MV/cm。(C)2011年美国物理学会。[doi：10.1063/1.3560062]
Using the tilted-pump-pulse-front scheme, we generate single-cycle terahertz (THz) pulses by optical rectification of femtosecond laser pulses in LiNbO3. In our THz generation setup, the condition that the image of the grating coincides with the tilted-optical-pulse front is fulfilled to obtain optimal THz beam characteristics and pump-to-THz conversion efficiency. By using an uncooled microbolometer-array THz camera, it is found that the THz beam leaving the output face of the LN crystal can be regarded as a collimated rather than point source. The designed focusing geometry enables tight focus of the collimated THz beam with a spot size close to the diffraction limit, and the maximum THz electric field of 1.2 MV/cm is obtained. (C) 2011 American Institute of Physics. [doi:10.1063/1.3560062]